Twin-nibbed marking instrument



FIG. 1 is a front elevational view of a twin-nibbed marking instrumentshowing my new design;

FIG. 2 is a rear elevational view;

FIG. 3 is a right side elevational view;

FIG. 4 is a left side elevational view;

FIG. 5 is a top plan view;

FIG. 6 is a bottom plan view; and

FIG. 7 is a perspective view on a reduced scale in an explodedcondition.

The ornamental design for a twin-nibbed marking instrument, as shown anddescribed.